fix: align react-dom with react so the app mounts

[QuickMythril]

The bug

ChibiHub 1.4.3 renders a blank page. The console shows:

Uncaught Error: Minified React error #527; args[]=19.2.8&args[]=19.2.7

Dependabot #13 bumped react to 19.2.8, but this repo has no matching react-dom PR, so react-dom stayed on 19.2.7. React 19 refuses to render a mismatched pair and throws at mount.

Why nothing caught it

Every existing check passed on the broken build:

• the unit tests never mount through react-dom;
• tsc --noEmit and vite build both succeed;
• the published bundle byte-matched its source, so the publish verification was green too.

I audited all 30 local app repos with a lockfile — ChibiHub is the only mismatched one; every other app has react and react-dom on the same version.

The fix

• react-dom → 19.2.8, matching react.
• A test that compares the versions the bundle actually resolves (importing version from each package), not the declared ranges — a caret range would have hidden this.
• Version bumped to 1.4.4 for the republish.

Verification

• 120 tests pass; tsc and build clean.
• Mutation-checked: pinning react-dom back to 19.2.7 fails the new test with expected '19.2.7' to be '19.2.8'.
• Rendered the rebuilt app headlessly: it mounts and paints, with zero console errors.